Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
sach ty » sach y, sach tu, sach thu
qua cam » qua cham, qua cac, qua ca
nang xa » lang xa, nang ma, mang xa
vi cua » vai cua
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) OR (nang x)) hoi. hieu qua cam dua ban thanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. hieu qua cam dua ban thanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) OR (nang x)) hoi. hieu qua cam dua ban thanh ((vi cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) OR (nang x)) hoi. hieu qua cam dua ban thanh ((vi cua) or (di cua)) tre*.